Abstract : This booklet outlines various methods of mechanized welding in which fluxes are utilized. The role played by the flux in these welding methods is elucidated. Existing fluxes are classified according to their technique of preparation, their use, and other characteristics. The main emphasis is placed on the description of fluxes used at home and abroad in arc welding and electroslag welding of steels and light metals. Details are given of the technique of preparation of fused fluxes, ceramic fluxes, and agglomerated fluxes. The booklet is intended for engineering-technical workers of the machine-building, ship-building and other branches of industry, as well as building-construction enterprises. (Author)